1168 



U. S. BUBEAU OF FISHERIES 



developed and, on the failure of remedial measures, the surviving fish were 

 distributed. The rearing ponds were also stocked with black-spotted trout 

 fry which will be held for later distribution. 



Reports again show extensive damage to fish traps and other property by 

 bears. The destruction of the fish traps generally results in a loss of fish, 

 since the bears are seeking them for food. 



Experiments were made with the use of Great Lakes trap nets for the 

 capture of adult trout near the outlet of the lake. A large number of fish 

 were taken, but the work was initiated too late in the season to bring about 

 the most effective results. 



SARATOGA (WYO.) STATION 



[S. M. AiNSWORTH, Superintendent] 



Using material purchased during the fiscal year 1929, a new nursery build- 

 ing 34 by 50 feet in dimensions was erected, thus increasing the station's 

 hatching capacity from 36 to 101 troughs. A retaining wall was built along 

 the earth bank ponds to prevent washouts and possible damage from burrowing 

 animals. The electric-power line from tlie town of Saratoga, completed 



Figure 3. 



Setting trap nets to capture black-sputted trout for the collection of eggs. 

 Yellowstone Park 



and put in operation at the beginning of the year, is giving very satisfactory 

 service. Completion of the work of painting all station buildings was ac- 

 complished in the summer of 1929. The collection of brook-trout eggs in the 

 Big Creek Lakes field was far below normal, and, as their quality was some- 

 what inferior, the deficiency in stock was made up by the transfer of 557,000 

 eggs of excellent quality from the Springville (Utah) station. One hundred 

 thousand No. IV2 fingerlings of this species were distributed during the spring 

 and 500,000 fingerlings were on hand when the year closed. From the sta- 

 tion brood stock of Loch Leven trout, 465,000 eggs were secured from which 

 420,000 fry were hatched. This lot of fish in the fingerling stage was carried 

 over the end of the year. 



The rainbow-trout egg collection in the Lost Creek field was below normal 

 on account of low-water stages. In some of tlie streams there was not suf- 

 ficient water to enable the fish to ascend to the traps and in such cases seining 

 had to be resorted to at the months of tlie streams. The fish were larger 

 than the average size and yielded more than the usual number of eggs per 

 fish. Of the 1,709,000 collected, 409,000 wei'e set aside to be hatched with 

 the view of returning the product to their native waters. On reaching the 

 eyed stage 247,000 of the remaining stock were transferred to the Saratoga 

 hatchery and 657,000 were shipped to other stations. In connection with 

 future operations in this field it is hoped to overcome the heavy losses of 



